The coolest and driest months are between November and February and this is the best time to visit the country, especially as this is when many of Lao’s vibrant festivals are held.
However, temperatures are significantly lower in the mountainous regions to the north of Laos and can be pleasant all year round, although it can get rather chilly in the evening during January and February. The hottest part of Laos is by far the southern region and it is best to avoid this area during the very hottest part of the year, especially March and April.
You can expect heavy rain practically every day during the rainy season. However, these rain showers tend to be over quite quickly and are easily avoided. Travelling during the rainy season can still be enjoyable, although be aware that many of the roads won’t be in as good a condition as during the rest of the year.
The peak tourist seasons occur from December to February and again in August. January can be very busy and it is a good idea to book in advance if you are travelling at the start of the year.